AWS Storage Gateway User Guide
Expanding the Size of a Volume
Expanding the Size of a Volume
As your application needs grow, you might want to expand your volume instead of adding more volumes
to your gateway. In this case, you can do one of the following:
• Create a snapshot of the volume you want to expand and then use the snapshot to create a new
volume of a larger size. For information about how to create a snapshot, see Creating a One-Time
Snapshot (p. 162). For information about how to use a snapshot to create a new volume, see
Creating a Volume (p. 63).
• Use the cached volume you want to expand to clone a new volume of a larger size. For information
about how to clone a volume, see Cloning a Volume (p. 157). For information about how to create a
volume, see Creating a Volume (p. 63).
Cloning a Volume
You can create a new volume from any existing cached volume in the same AWS Region. The new volume
is created from the most recent recovery point of the selected volume. A volume recovery point is a point
in time at which all data of the volume is consistent. To clone a volume, you choose the Clone from last
recovery point option in the Create volume dialog box, then select the volume to use as the source. The
following screenshot shows the Create volume dialog box.
Cloning from an existing volume is faster and more cost-effective than creating an Amazon EBS
snapshot. Cloning does a byte-to-byte copy of your data from the source volume to the new volume,
using the most recent recovery point from the source volume. Storage Gateway automatically creates
recovery points for your cached volumes. To see when the last recovery point was created, check the
TimeSinceLastRecoveryPoint metric in Amazon CloudWatch.
The cloned volume is independent of the source volume. That is, changes made to either volume after
cloning have no effect on the other. For example, if you delete the source volume, it has no effect on the
cloned volume. You can clone a source volume while initiators are connected and it is in active use. Doing
so doesn't affect the performance of the source volume. For information about how to clone a volume,
see Creating a Volume (p. 63).
API Version 2013-06-30
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